"Doubt is useful for a while. We must all pass through the garden of Gethsemane. If Christ played with doubt, so must we."

科学是跨越数代人的协作努力。

要真正理解宇宙，我们必须首先理解我们理解的极限。

"A man's memory might have only a hundred clear days in it and he has lived thousands."

1925年，孙中山在病榻前对张学良说，指出苏联是红色帝国主义。